Bardugo: When Nikolai first walked onto the page in Siege and Storm, I really had no idea what I was getting into.
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With Nikolai missing, Isaak is asked to impersonate the king so they can continue with the festival.
Hanne is frustrated that Nina used her.
King of Scars is a novel for longtime fans of the series, and readers would be well-served to read both the Shadow and Bone and Six of Crows series before diving in, else they may not recognize many of the characters who flit in-and-out of this novel.
I think the duology is still my favorite of the Grisha books, but this one is a very close second.